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/*
 * @test
 * @bug 8298420
 * @library /test/lib
 * @summary Testing PEM API is thread safe
 * @enablePreview
 * @modules java.base/sun.security.util
 */

import java.security.*;
import java.util.*;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

import jdk.test.lib.security.SecurityUtils;

public class PEMMultiThreadTest {
    static final int THREAD_COUNT = 5;
    static final int KEYS_COUNT = 50;

    public static void main(String[] args) throws Exception {
        PEMEncoder encoder = PEMEncoder.of();
        try (ExecutorService ex = Executors.newFixedThreadPool(THREAD_COUNT)) {
            Map<Integer, PublicKey> keys = new HashMap<>();
            Map<Integer, String> encoded = Collections.synchronizedMap(new HashMap<>());
            Map<Integer, String> decoded = Collections.synchronizedMap(new HashMap<>());
            final CountDownLatch encodingComplete = new CountDownLatch(KEYS_COUNT);
            final CountDownLatch decodingComplete = new CountDownLatch(KEYS_COUNT);

            // Generate keys and encode them in parallel
            for (int i = 0; i < KEYS_COUNT; i++) {
                final int finalI = i;
                KeyPair kp = getKeyPair();
                keys.put(finalI, kp.getPublic());

                ex.submit(() -> {
                    encoded.put(finalI, encoder.encodeToString(kp.getPublic()));
                    encodingComplete.countDown();
                });
            }
            encodingComplete.await();

            // Decode keys in parallel
            PEMDecoder decoder = PEMDecoder.of();
            for (Map.Entry<Integer, String> entry : encoded.entrySet()) {
                ex.submit(() -> {
                    decoded.put(entry.getKey(), decoder.decode(entry.getValue(), PublicKey.class)
                            .toString());
                    decodingComplete.countDown();
                });
            }
            decodingComplete.await();

            // verify all keys were properly encoded and decoded comparing with the original key map
            for (Map.Entry<Integer, PublicKey> kp : keys.entrySet()) {
                if (!decoded.get(kp.getKey()).equals(kp.getValue().toString())) {
                    throw new RuntimeException("a key was not properly encoded and decoded: " + decoded);
                }
            }
        }

        System.out.println("PASS: testThreadSafety");
    }

    private static KeyPair getKeyPair() throws NoSuchAlgorithmException {
        String alg = "EC";
        KeyPairGenerator kpg = KeyPairGenerator.getInstance(alg);
        kpg.initialize(SecurityUtils.getTestKeySize(alg));
        return kpg.generateKeyPair();
    }
}